import type { Algorithm } from '../types.js';
import type { EncryptionAlgorithmStrategy } from './algorithm.js';
/**
 * AES-256-GCM encryption strategy
 * Implements authenticated encryption with associated data (AEAD)
 * Industry standard for secure encryption with built-in authentication
 */
export declare class AesGcmStrategy implements EncryptionAlgorithmStrategy {
    readonly algorithm: Algorithm;
    readonly type: "encryption";
    supports(algorithm: Algorithm): boolean;
    encrypt(plaintext: Uint8Array, key: Uint8Array, options: {
        additionalData?: Uint8Array;
        iv?: Uint8Array;
    }): Promise<{
        ciphertext: Uint8Array;
        iv: Uint8Array;
        authTag: Uint8Array;
    }>;
    decrypt(ciphertext: Uint8Array, key: Uint8Array, options: {
        iv: Uint8Array;
        authTag?: Uint8Array;
        additionalData?: Uint8Array;
    }): Promise<Uint8Array>;
}
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